Zobrazeno 1 - 10
of 13
pro vyhledávání: '"Tim Wittmann"'
Autor:
Mirosław Majkut, Sławomir Dykas, Krystian Smołka, Tim Wittmann, Axel Kuhlmann, Florian Thorey
Publikováno v:
Energies, Vol 17, Iss 21, p 5459 (2024)
Atmospheric air, being also a moist gas, is present as a working medium in various areas of technology, including the areas of airframe aerodynamics and turbomachinery. Issues related to the condensation of water vapor contained in atmospheric air ha
Externí odkaz:
https://doaj.org/article/0a1d1961ab884f318c4480bc5f99015a
Publikováno v:
Machines, Vol 10, Iss 11, p 1053 (2022)
The air-management system of a proton exchange membrane fuel cell (PEMFC) is responsible for supplying the fuel cell stack with ambient air at appropriate conditions. The compressor of the air-management system can be partly driven by utilizing the f
Externí odkaz:
https://doaj.org/article/68ddf87246e244a7a8b345449d916b3b
Publikováno v:
Machines, Vol 10, Iss 1, p 59 (2022)
A mobile fuel cell systems power output can be increased by pressure amplification using an electric turbocharger. These devices are subject to frequent transient manoeuvres due to a multitude of load changes during the mission in automotive applicat
Externí odkaz:
https://doaj.org/article/dc36baf6d7284186b1fc52dce8c18b40
Publikováno v:
International Journal of Turbomachinery, Propulsion and Power, Vol 6, Iss 3, p 23 (2021)
Radial turbines used in automotive fuel cell turbochargers operate with humid air. The gas expansion in the turbine causes droplets to form, which then grow through condensation. The associated release of latent heat and decrease in the gaseous mass
Externí odkaz:
https://doaj.org/article/9c4308d36bb84c55a3c1f0ef0f1affcd
Publikováno v:
Experimental and Computational Multiphase Flow. 5:344-356
The ability to accurately model condensing flows is crucial for understanding such flows in many applications. Condensing flows of pure steam have been studied extensively in the past, and several droplet growth models have been derived. The rational
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::9487a54e837a6d5738aa1c428c817169
https://doi.org/10.1007/s42757-022-0152-8
https://doi.org/10.1007/s42757-022-0152-8
Publikováno v:
Volume 10B: Turbomachinery — Axial Flow Turbine Aerodynamics; Deposition, Erosion, Fouling, and Icing; Radial Turbomachinery Aerodynamics.
Cathode systems of proton exchange membrane fuel cells are tasked with providing compressed air for the fuel cell stack. The exhaust gas from the fuel cell has a pressure potential which can be utilised in a turbine to partially power the compressor.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::cd1a2d59278ec76702496c367061121a
https://doi.org/10.1115/gt2022-82279
https://doi.org/10.1115/gt2022-82279
Autor:
Piotr Wiśniewski, Sławomir Dykas, Mirosław Majkut, Krysian Smołka, Michał Nocoń, Tim Wittmann, Jens Friedrichs
Publikováno v:
Applied Thermal Engineering. 217:119185
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::3ac3ee3dd174c5e065b6576cda548f45
https://doi.org/10.1016/j.applthermaleng.2022.119185
https://doi.org/10.1016/j.applthermaleng.2022.119185
Publikováno v:
Volume 6: Ceramics and Ceramic Composites; Coal, Biomass, Hydrogen, and Alternative Fuels; Microturbines, Turbochargers, and Small Turbomachines.
Exhaust gas of an automotive fuel cell is enriched with water vapour and has a pressure potential which can be utilized by a turbine. The gas expansion in the turbine leads to droplet nucleation and condensation. This results in a release of latent h
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::9ab3102394c20d83f9922cb55392c4af
https://doi.org/10.1115/gt2021-58472
https://doi.org/10.1115/gt2021-58472
Publikováno v:
Journal of Engineering for Gas Turbines and Power. 143
This study investigates the applicability of an Euler–Lagrange approach for the calculation of nucleation and condensation of steam flows. Supersonic nozzles are used as generic validation cases, as their high expansion rates replicate the flow con
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::2fc6c41f49e41c756e11712b7f95efb2
https://doi.org/10.1115/1.4049859
https://doi.org/10.1115/1.4049859
Publikováno v:
Volume 2C: Turbomachinery.
This study investigates the applicability of an Euler-Lagrange approach for the calculation of nucleation and condensation of steam flows. Supersonic nozzles are used as generic validation cases, as their high expansion rates replicate the flow condi
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::b592e0c4e9117001dcea312af0727fc5
https://doi.org/10.1115/gt2020-16199
https://doi.org/10.1115/gt2020-16199